Jen, I have been away for a few days and look at what happens!
This story is... I mean I think you are amazing, your boss is amazing, his girlfriend is amazing...I am so happy all this is going on... believe me, I have just read the thread all the way through, and I am so touched I have tears in my eyes (and that's for real, I am not kidding). This is not a story, it's a fairy tale.
I vote this the best thread ever in the H forum.
I am really sorry I wasn't here to help you with your choice, but all I can tell you is that you have been extremely well adviced, I think the decision your boss has taken (or better the decision that YOU have led him to take, without taking him away the satisfaction of being THE ONE who is choosing), well this decision absolutely is the best choice.
The reputable resellers list is, (in case he feels better with that option), well... simply reputable, so you should have no problem.
And please, let us know what your boss ends up with.
And congratulations for this unbelievably generous and smart christmas present that you will receive from your boss.
Still with tears in my eyes.